A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which of the following conditions applies to the first ball?
a. maintains the same velocity as before
c. comes to rest
b. has one-half its initial velocity
d. moves in the opposite direction
C
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A given individual is unable to see objects clearly when they are beyond 75 cm. What focal length contact lens should be used to correct this problem?
a. 75 cm c. -100 cm b. -75 cm d. -33.3 cm
A counterflow double pipe-heat exchanger is used to heat 0.8 kg/s of water from 40ºC to 80ºC with oil having specific heat of 2.1 kJ/kg?K. Assume the maximum oil flow can be 1.0 kg/s and that oil enters the heat exchanger at 170ºC. If the overall heat transfer coefficient is 425 W/m^2?K, determine the surface area of the heat exchanger and the effectiveness of the heat exchanger. Equation 9-29 defines the effectiveness.
What will be an ideal response?
Which types of galaxies have a clearly defined disk component?
A) spirals only B) ellipticals only C) lenticulars only D) irregulars only E) spirals and lenticulars
Evaporation and precipitation are in balance over the
A) polar ice caps. B) continents. C) oceans. D) equator.